Technical data

Siemens SIP · 2008
12 Motor Protection / 7SK80
12
Technical Data page 8
Technical data
(Sensitive) ground-fault protection (ANSI 64, 50Ns, 51Ns, 67Ns) (cont'd)
Ground-fault pickup for all types of ground faults
Definite-time characteristic (ANSI 50Ns)
Setting ranges
Pickup current 50Ns-2 Pickup,
50Ns-1 Pickup; (I
EE
>, I
EE
>>)
For sensitive 5-A-transformer
For normal 5-A-transformer
Delay times T for 50Ns-2 Delay,
50Ns-1 Delay (T
IEE
>, T
IEE
>>)
Dropout delay time T
Dropout
0.005 to 8 A
1)
(in steps of 0.005 A)
0.25 to 175 A
1)
(in steps of 0.05 A)
0 to 320 s ∞ (disabled)
(in steps of 0.01 A)
0to60s(instepsof0.01s)
Operating times w 50 ms (directional/non-directional)
Dropout ratio Approx. 0.95 for 50Ns/I
EE
>50mA
Tolerances (measurement)
Pickup threshold
For sensitive 5-A-transformer
For normal 5-A-transformer
Delay times
3 % of setting value or 5 mA
1)
3%ofsettingvalueor75mA
1)
1%ofsettingvalueor10ms
Ground-fault pickup for all types of ground faults
Inverse-time characteristic (ANSI 51Ns)
User-defined characteristic
Defined by a maximum of 20 pairs
of current and delay time values,
directional measurement method
“cos phi and sin phi”
Setting ranges
Pickup current 51Ns; I
EEp
For sensitive 5-A-transformer
For normal 5-A-transformer
Time multiplier T
51Ns
, I
IEEp
0.005 A to 7 A
1)
(in steps of 0.005 A)
0.25 to 20 A
1)
(in steps of 0.05 A)
0.1 to 4 s or ∞ (disabled)
(in steps of 0.01 s)
Pickup threshold Approx. 1.1 · I
51Ns
/1.1 · I
EEp
Dropout ratio Approx. 1.05 · I
51Ns
/1.05 · I
EEp
for I
51Ns
(I
EEp
)>50mA
Tolerances
Measurement tolerance
Operating time tolerance
in linear range
3 % of setting value or 1 mA
7 % of reference (calculated) value for
2 w I/I
51Ns
(I
EEp
) w 20 + 2 % current
tolerance or 70 ms
Direction determination for all types of ground-faults (ANSI 67Ns)
Measuringmethod“cosϕ/sin ϕ”
Direction measurement I
N
and V
N
measured or
3I
0
and 3V
0
calculated
Measuring principle Active/reactive power measurement
Setting ranges
Measuring enable I
Release direct.
(current component perpendicu-
lar (90 °) to directional limit line)
For sensitive 5-A-transformer
For normal 5-A-transformer
0.005 to 8 A
1)
(in steps of 0.005 A)
0.25 to 175 A
1)
(in steps of 0.05 A)
Dropout ratio Approx. 0.8
Direction phasor ϕ
Correction
Dropout delay T
Reset delay
–45°to+45°(instepsof0.1°)
1to60s(instepsof1s)
Measuringmethod“ϕ (V
0
/I
0
)”
Direction measurement I
N
and V
N
measured or
3I
0
and 3V
0
calculated
Minimum voltage V
min.
V
0
measured
3V
0
calculated
Phase angle 50Ns ϕ
Delta phase angle 50Ns Δϕ
0.4to50V(instepsof0.1V)
10 to 90 V (in steps of 1 V)
–180 ° to 180 ° (in steps of 0.1 °)
0°to180°(instepsof0.1°)
Angle correction for cable CT
Angle correction F1, F2
(for resonant grounded system)
0°to5°(instepsof0.1°)
Current value I
1
, I
2
for angle
correction
For sensitive 5-A-transformer
For normal 5-A-transformer
0.005 to 8 A
1)
(in steps of 0.005 A)
0.25 to 175 A
1)
(in steps of 0.05 A)
Tolerances
Measurement tolerance
Angle tolerance
3 % of setting value or 1 mA
3°
Breaker failure protection (ANSI 50BF)
Setting ranges
Pickup thresholds 0.25 to 100 A
1)
(in steps of 0.01 A)
Delaytime 0.06to60sor∞ (in steps of 0.01 s)
Times
Pickup times
with internal start
with external start
Dropout times
is included in the delay time
is included in the delay time
Approx. 25 ms
Tolerances
Pickup thresholds
Delay time
3%ofsettingvalueor75mA
1)
1%or20ms
Flexible protection functions (e.g. ANSI 27, 32, 37, 47, 50, 55, 59, 81R)
Operating modes/measuring quantities
3-phase
1-phase
Without fixed phase relation
Pickup when
I, I
1
, I
2
, I
2
/I
1,
3I
0
, V, V
1
, V
2
,3V
0
,
P
forward
, P
reverse
, Q
forward
, Q
reverse
,cosϕ
I, I
N,
I
NS,
I
N2
, V, V
N
,V
x
,
P
forward
, P
reverse
, Q
forward
, Q
reverse
, cos ϕ
f,df/dt,binaryinput
Exceeding or falling below threshold
value
Setting ranges
Pickup thresholds
Current I, I
1
, I
2
, 3I
0
,I
N
Current ratio I
2
/I
1
Sensitive ground current I
NS
Voltages V, V
1
, V
2
,3V
0
Displacement voltage V
N
0.25 to 200 A
1)
(in steps of 0.01 A)
15 to 100 % (in steps of 1 %)
0.001 to 1.5 A (in steps of 0.001 A)
2to260V(instepsof0.1V)
2to200V(instepsof0.1V)
Power P, Q
Powerfactor(cosϕ)
Frequency f
N
=50Hz
f
N
=60Hz
Rate-of-frequency change df/dt
10 to 50000 W
1)
(in steps of 0.1 W)
–0.99 to +0.99 (in steps of 0.01)
40 to 60 Hz (in steps of 0.01 Hz)
50 to 70 Hz (in steps of 0.01 Hz)
0.1to20Hz/s(instepsof0.01Hz/s)
Dropout ratio >- element
Dropout ratio <- element
Dropout difference f
Pickup delay time (standard)
Pickup delay for I
2
/I
1
Trip delay time
Dropout delay time
1.01 to 3 (insteps of 0.01)
0.7 to 0.99 (in steps of 0.01)
0.02 to 1 Hz (in steps of 0.01 Hz)
0to60s(instepsof0.01s)
0 to 28800 s (in steps of 0.01 s)
0 to 3600 s (in steps of 0.01 s)
0to60s(instepsof0.01s)
Note: When using the sensitive transformer, the linear range of the mea-
suring input for sensitive ground fault detection is from 0.001 A to
1.6 A or 0.005 A to 8 A. The function is however still preserved for
higher currents.
1) At I
nom
= 1 A, all limits divided by 5.
Note: Due to the high sensitivity, the linear range of the measuring input
I
nom
with integrated sensitive input transformer is from 0.001 · I
nom
to 1.6 · I
nom
. For currents greater than 1.6 · I
nom
correct direction
determination can no longer be guaranteed.